Furnace



Jan. 24, 1928.

E. P. STEVENS ET AL FURNACE Filed Nov.

16, 1922 2 Sheets-Sheet l )INVENTORS A TTORNEY s Jan. 24, 1928.

1,656,963 E. P. STEVENS ET AL FURNACE Filed Nov. 16, 1922 2 Sheets-Sheet 2 WITNESS. 3f

ATTORNEYS Patented Jan. 24, 1928.

UNITED STATES PATENT OFFICE.

ENOOH I. STEVENS, OF CHICAGO, ILLINOIS, AND RALEIGH J. HIMMELRIGHT, OF NEW YORK, N. Y.; SAID HIMMELRIGHT ASSIGNOR TO AMERICAN ARCH COMPANY, A CORPORATION OF DELAWARE, AND SAID STEVENS ASSIGNOR T AMERICAN ARCH COMPANY A CORIPORATION OF DELAWARE.

FURNACE.

Application filed November 16, 1922. Serial No. 601,202,

Our invention relates to furnaces, and more especially to furnace roofs with movable sections or bungs such as those of metallurgical furnaces. We'aim to provide for opening such roofs (for charging or other purposes) in the simplest and most convenient way, and without complicated or costly mechanism or forms of construction.

How these and other advantages can be realized through our invention will become apparent from our description hereinafter 0' the best embodiment of the invention known to us. I

In the drawings, Fig. 1 is a side view of a metallurgical furnace conveniently embodying our invention, with the roof opening closed.

ig. 2 is a similar new with the roof opening open, a somewhat different portion of the furnace structure appearing.

Fi 3 shows a transverse section through the urnace and the movable section of its roof, taken as indicated by the line 3-3 in Fig.1.

Fig. 4 is an enlarged fragmentary sectional view, takenas indicated by the line 4-4 in Fig. 3, illustrating the construction and mounting of the movable roof section; and Fig. 5 is an enlarged section on the line 5-5 of Fig. 1 illustrating details of construction.

Referring to the drawings generally, and

especially to Figs. 1, 2 and 3, it will be seen that the furnace illustrated comprises the usual front and side walls 5 and 6, 6, the stack 7 at the rear, and the roof 8,-with the last of which our present invention is more especially concerned. To the front of the furnace chamber is the firebox 9, shown as provided with a grate 10, and behind the fire-box 9 are the bridge wall 11 and the metallurgical hearth 12. From about the rear of the hearth 12, the corresponding portion of the roof 8 slopes downward somewhat, thus forming a passage 14 of diminis'hing size leading to the stack 7. This rear tection of thereof 8 comprises a series of stationary roof bungs or spans 15, which are supported from longitudinal strength members or stringers 16 that extend along the sides 6 of the furnace, on supporting uprights 17 at intervals therealong. The portion of the furnace roof 8 that can be opened for charging or other purposes usually comprises all the bungs 21 (termed charging bungsf) in front of the stationary bungs 15. Ordinarily, the only way of opening up the roof 1s to lift off and shift aside a suitabl e group or section of the charging bungs 15 with a derrick or crane. This, however, requires considerable head room; chills the bungs so handled a good deal; involves danger to persons working about the furnace from hotspallingsfrom the charging bungs, f the latter are swung over them; generally involves the provision of more .derricks or cranes than would otherwise be necessary; and 1ssub1ect to other disadvantages. In the embodiment of our invention here illustrated, on the other hand, the roof section 20 is arranged to be supported by track or rails 22, so that it can be shifted aside to leave an opening over the hearth 12 without the necessity of lifting it off .with a derrick or the like. To facilitate this, the roof section 20 may be provided with anti-friction rolllng supports in the form of flanged wheels 23 adapted to run on the rails 22.

As shown, the rails 22 extend along the furnace sides 6 on lateral uprights 24 similar to the uprights 17, so that the roof section 20 can be moved forward to leave an opening just in front of the stationary rear bungs 15. Sand seals 25 may be provided to prevent leakage of the hot gases between the roof section 20 andthe tops of the side walls 6, 6. The whole front portion of the roof being movable, in the, present case, to overhang beyond'the limits of the usual furnace structure, a shelter 26 is preferably provided to protect the firemen working in front of the furnace from the heat of the movable roof section 20 and from any spallings therefrom. As shown, this shelter 26 has the form of a shallow sheet-metal box or tray with a refractory bottom lining 27. It is supported by the front uprights 24 ,and by an angle bar 28 attached to the front furnace wall 5.

Even in cases where (as-shown) the roof section 20 does not actually rest on the side walls 6 of the furnace structure, it may still be found advantageous to rovide for lifting or elevating it a little w on it is to be moved, to assure ample clearance everywhere, and to avoid injury to the sand seals 25. It is convenient to elevate the track 22 relative to the rest of the furnace structure for this purpose. As shown in Fig, 3, the rails 22 are of angle bar section. and are mounted on the uprights 24 with some freedom for up and down movement by inserting their vertical flanges in slots 29 in the upper ends of the uprights. The rails 22 may" be elevated or lowered as desired by means of rotatable eccentric cams 30 mounted on pivot or axle members 31 in the forked upper ends of the uprights24, and engaged beneath the horizontal flanges of the rails. The eccentrics 30 may be turned by means of cranks 32, and the vertical rail flanges may be slotted as shown at 33 to accommodate the members 31 and permit free up and down movement, of the rails. The engagement of the members 31 in the rail slots 33 prevents longitudinal displacement or shiftin of the rails 22. The slots 33 are extended downwardly a sufricient distance to erform this function by applying and suitably securing in any desired manner a plate 33 to the vertical flangeof the rail 22 at each axle member 31.

Referring now, more especially to Figs. 3 and 4, as well as to Figs. 1 and 2, it will be seen that the charging bungs 21 each com osed of a series of individual ung bric 35) formin the movable roof section 20 are supported by a framework composed of strength members or stringers 36 ex- F tending along in the direction of the track 22 and strength members or cross beams 37 extending. transversely of the track and interconnecting the members 36, together with additional strength members 38 extending transversely between and interconnecting said members 36, and supported by them. As shown, the wheels 23 are mounted on pivot forgings 39 attached to the ends of the channel beams 37, and the stringer members 36 are in channel lengths correspondin to the spacing of the beams 37 and secure to the latter inside the forgings 39 by means of angle clips 41. The angle beams 38 rest on and are secured to the lower inturned flanges of the stringer members 36. The bung brick 35 have dovetails 42 attheir upper ends which are grasped and secured, m suitable agroupment of the brick by clamping grapples 43 bolted to 'ether as indicated at 44. The groups of suspended from the beams 37 and 38 by means of hanger rods 45 and 46, respectively, each taking on to a bolt 44. The rods 45 extend through the flanges of the channels 37, while the rods 46 are provided with laterally extending grapples 47 that take over the upright flanges of the angles'38.

'lihe bricks of the bung units are yielding pressed together by means of rin 50 ee Fig. 5) operating through iii; 111% brick 35 are dium of bolts 51, pivoted arms 52, shoes 53 and longitudinally extending metal plates 54.

Thestationary bung brick at 15 are suspended in a similar manner except that their beams 38 are doubled up back to back, with the hanger rods 48 extending between them, and the ends of these beams 38 (which are cambered somewhat) rest and are secured directly on the horizontal flanges of the angles 16.

What we claim is:

l. The combination of a furnace with a movable roof section normally sealed with the furnace side walls; supporting track for said roof section extending alongside and forward in front of the furnace; means for elevating said roof section from said side walls for forward movement alon the track; and a protective shelter extending in front of the furnace, beneath the movable roof section when in such forward position.

2. The combination of a furnace with supporting rails for a movable roof section; a movable roof frame, with rolling supports on said rails, including strength members extending along said rails, and transverse strength members interconnecting those first mentioned; and a series of roof bungs supported by said latter strength members, and forming with said frame a movable roof section for the furnace.

' 3. The combination of a furnace with supporting rails for a movable roof section beams extending transversely between said rails with wheel supports resting on the latter, strength members interconnecting said beams extending along said rails, beams extending transversely between and supported by said strength members, and a series of roof bungs suspended from the transverse beams.

4. In a furnace structure, the combination of a movable roof section, supporting track therefor, and rotatable cam members engaging the track and adapted, upon rotation, to elevate the track and lift said roof section from the furnace structure for movement along the track.

5. In'a furnace structure, the combination of a movable roof section, supporting track therefor, and rotatable cam members engaging the track and adapted, upon rotation, to elevate the track and lift said roof section from the furnace structure for movement along the track, together with means for preventing lateral movement of the track in any direction during rotation of the cams.

6. In a furnace structure, the combination of amovable roof section, sup orting track therefor, axles mounted on the furnace structure, and rotatable members eccentrically mounted onjaid axles and in engagement with the track and adapted, upon rotation, to elevate the track and lift said roof section from the furnace structure for movement along the track, said axles engaging the track to prevent longitudinal movement of the latter.

7. The combination of a furnace, a movahle roof section therefor, supportin "track for said roof section, and means on t e furmace structure for elevating the track in a straight perpendicular from its lower posi- 10 tion to lift said roof section from the furnace structure for movement along the track.

In testimony whereof, we have hereunto signed our names.

ENOCH P. STEVENS. RALEIGH J. HIMMELRIGHT. 

